Sheesh… A bit of insight:
Grand Juries and 'Special Councils' do not decide whether or not someone is guilty. They determine only if there is enough evidence to proceed with a trial.
The reason exculpatory evidence can be with-held from them (or otherwise SHOULD be ignored) is because it is the job of the court to determine guilt.
Consider a case where there is ample evidence to indict - but the state declines to prosecute and the case never goes to trial. The person appears "guilty as sin" - but a case where the exculpatory evidence is outlined never manifests - and so the would-be-defendant remains a crook by perception.
Where there is sufficient evidence to bring a case, the state is morally obligated to try that case where the defendant must be proved guilty or deemed not guilty, rather than leaving the issue to the imaginations of the public or artistic liberties of media.
Apply that here. Mueller said, in so many words, this. He can't indict the President. Nor can Barr. Congress, however, can pass articles of impeachment and send the case to trial at the Senate.
This is why Maxine and Pelosi are both backing away from impeachment. Maxine, especially, is now calling for Trump to resign.
This is an old game. "We will take you to court and appeal and appeal and appeal" - to their kangaroo courts. "But if you just resign…." It's a settle-out-of-court agreement to try and save one's self the hassle of court cases.
So, be careful what you wish for. President Trump has no fear of taking this through impeachment. Either they accept no collusion or they push the impeachmebt/obstruction narrative. If they go for impeachment, they have to go on the record as voting or skipping town.
AOC is doing a wonderful job of keeping the pressure on. If they want her voter demographic, they need to pursue impeachment - or explain why they got cold feet.
Everything is according to plan.